Dust arrester



Aug. 11, 1931. R. H. MOORE 8,736

DUST ARRESTER Filed Feb. 26, 1927 5 Sheets-Sheet l ooooanooo on.

ava/275 '1 Aug. 11, 1931. R. H.'MOORE nus'r Annfiswnn Filed Fb. 26. 19275 Sheets-Sheet 3 A g 1931- R.. H. MOORE 1,818,736

- nusr ARRESTER Filed Feb. 26, 1927 Sweets-Sheet 4 tion of the screeningunits Fi'g'. Gis

Patented Aug. 11, 1931 I f UNITED; PATENT; 0 Price RAYMOND H. MOORE, orHARVEY, ILLINOIS, nss eiv'on m'o warm Ins CORPORATION, orifinnvmutnmois;aconro-ai 'rroiv or rumors" DUST ARRESTER applicatibn flleaIebruary 26,1 927. Seria l"-No. 1'7 1,127.

The present invention relates to dust arrest'ers One object of.the'inventionzis to provide an arrester which is; composed of assembled'5 individual .units with frames and fabric in which the margins oi thetabricare padded to reduce the wear thereon; which iscomposed ofindividually supported: framed screening units in which such :units: are,in-i 1 0 dividually' removable and. replaceable and of improvedsectional construction ;-f which is composed of: like screeningunitslwh-ich pro ride for a substantially/full discharge area from thescreen; andin which the screen F5 jug-units 'areivi'bratedby pulsations,as, distinguished from: violent shocks to avoid wear of the fabric inthe units. Another objectxot the inventionis to' provide a dustai'rester which is generally of 119? new and improved construction, maybe inanuf-a'ctured ata low .cost and isexceedingly eflicient inkopemtion: I

e Other objects of the" invention and ,the various advantages a ndi.characteristics of the present dust arrester constructionwillbe apparentfrom a con'sid'erationof the: detailed description.

The invention consists in the several novel features hereinaitersetforth and more par-- ticularly defined by claims at the conclusionhereof. o

In the drawings which accompany and form a part of this specificationordisclosure and in which like numerals and characters of referencedenote corresponding parts throughout the several views; Fig. 1 is atransverse, section of an arreste'r embodying the invention. Fig. 2 isva hori zontal section. Fig. 3- is a section' 't'aken on the line 3 -3 ofFig. 2 4f isa hotiaontal section through several of thesc'reening units"and one of the sidewalls; Fig. '5 is 39sec tionalperspectiveillustrating the construe v a Per spectiveof one of thescreening units. Figs.

7, T 8 and 8 are. perspectives, illustrating detailsof a screen frame.Fig. 9 is a vertical section through the vibrating device. Fig; 0' 1Oisa; section on the line 10-40 of Fig. 9;.

Fig. 11 is a detail of the; outlet valve for the accumulated dust. I p 1v v The dust arrester which forms the subject matter of this inventioncomprises, a casing A which is preferably of metalplate construction andis mounted upon a supportingv frame B of any desired construction. The:casing comprises a back; Wall 0 to which is connected an'a-ir intake a abottom comprising discharge hoppers a? and a and a. floor section a? infront of the hoppers and securedon channel-beamsa; a front'wall a, towhich is connected an air I discharge. pipe a for conducting thepurified air-trom' I a transverse chamber a at the frontof the casing; atop wall a and side wallsa and 0}". The casing is built up .niainly'ofmetal plates which have their contiguous margins provided with rightangled flanges a and 00 to form a lapped seam between. which, suitablepacking,- such as tar paper, is interposed, the flanges being bolted toether. O ne ofthe contiguous flanges is ,p-re era-bly reverted, as at a;to close-the edge of the seam. A baffle a which is spaced by brack 75ets' 1 0 from the intake a is provided to de- Y fleet theair laterallyand cause it to bedi's-. tributed transverselyof the receiving chamber aat-the back of the casing.- Suitable means, such as'an exhaustfan orblower (not shown): will belused to force the dust laden air throughthecasingt Therasing containsa series of screening units which arealikeiii construction so, that thejcapacity. ofthe arrestermay be variedby varying the number of the screening units, Thessec tional plateconstruction herei-nbefore dc scribedfpermits of the expansion-of thecasing for this-purpose. To the top a of the. casing is'secured achannel bar1'5; to'iwhich the upper ends of the screeningl'unit's aresecured, as hereinafter set forth. A chain nel 16' extends transverselyacross-the frame adjacent the bottom thereotto support and retain thelower front endsof the screen units. This channel: is formed bar comprising a web; 17 (Fig. 5) W,ith an upwardly extendin flange 1 8 and adownwardly extendingv ront flange 19 and a removable strip 20'whiclipermits the screen; 1-00 '015- a metal v units to be placed in andremoved from channel 16 upon removal of the bolts 21 which secure thestrip against flange 19. The plates, forming the top and bottom and thefront and back of the casing, overlap one another, and strips of tarpaper 22 are placed between the laps to seal the joints against leakageof air. Similar strips 22 are also placed in the top seams between therims of hoppers a and a and the side walls and flange 19, andbetween thetop of channel 15 and top a to prevent air from passing into chamber awithout passing through the screens. A door 23 is usually provided inthe front wall a to provide access to the front ends of the screeningunits I and to chamber an? in the casing.

cloth. Preferably, the cloth extends contin The screeningunits,generally designated C, are adapted to fit together side-by-side, andare alike in construction, so that arresters of different sizes andcapacities 'may be built up by varying the number of units and thewidthof the casing. Each unit 0 comprises a frame and suitable fabric D,such as cloth. The fabric is applied so as to form rectangular sidepieces which extend over the sides of the frame and through which airmust pass in transit from the inlet chamber (0 to the exhaust chamber aThis fabric is adapted to arrest the dust so it will fall into, hoppersa and a in which it will accumulate. Each screen-frame comprises abottom rail 0 a back rail 0 a top-rail 0 a pair of front corner bars 0and 0" which are spaced apart by the top and bottom rails, and a seriesof intermediate horizontal rails c which have their rear ends secured tothe back rail and their front ends terminating between, and flush with,the front corner rails. Diagonal stay-wires a are stretched across andsecured to the sides of the frame to hold the fabric D at theframe-sides. These wires are secured to the bars 0 by staples 0 and arelapped around nails 0 on the top and bottom rails of the frame. Inpractice, it-has been found that when the cloth used in these screeningunits isdirectly secured to the frame, it soon becomes worn as theresult of the vibration to which the frames are subjected to cause thefabric to release the dust. To overcome this disadvantage, the cloth Dis spaced from the side faces of the frame-members by pad ding. Thelatter is in the nature of strips ofcord (Z which are secured to theframe by nails d before the cloth is secured in place. These cords dextend lengthwise of the top and bottom rails c and c of the frame andupwardly at the rear corners of the rear upright of the frame, so thatthe cloth will be correspondingly spaced from the frame-sides, and thecord will form a padding or cushion between the frame and the uouslyacross the back of the rear rail 0 as at (Z (Fig. 5). The cord cl alsospaces the fabric from the heads of the nails 0 used for securing thestay wires 0 to the top and bottom rails of the frame.

To secure the top and bottom margins of the cloth of the rails c and 0respectively, grooves 0 are formed in'the side faces of said railsimmediately below the cord d on the bottom rail 0 and above the cord 03on the top rail 0 and around the back of said rails, and bottom marginsof the cloth D are folded into said grooves and secured therein by acord d which fits snugly in the groove and is secured therein by nails(1 so that these margins of the cloth will be securely connected to theframe and so that when it is desired to replace the cloth, it may bereadily removed upon removal of the cords (Z When secured in thegrooves, these cords serve as a marginal reinforcement at the pointswhere the cloth is secured to; the frame. The front margins of the clothD are secured against the back faces of the front bars 0 and 0 byvertical strips (Z which are conterminous with the upper and lower endsof said bars. The front margins of the cloth are extended to lapportions of the side faces of the bars 0 and c and are there secured bynails (Z to said bars.

The upper ends of the bars 0 c and strips d are extended a shortdistance above the top rail 0 The space between the projecting portionsof the bars and strips are filled by a block 0. A bolt 0 (Fig. 6)extends vertically through top rail 0 block 0 and through the lowerflange of the channelled beam 15 of the casing to independently supportthe upper portion of each screen frame in place. The lower ends of thebars 0 and 0 and strips d" of each screen frame are also extended toproject below the lower rails 0 and blocks 0 are suitably securedbetween the projecting ends thereof. The downwardly projecting portionsof these bars and strips fit into the channel 16 of the casing. A stripof felt 25 extends over the top ofthe projecting portion at the top andfront of the screen frame and across the front and back thereof, to forman air-tight joint between the frame and the channel-bar 15. A strip offelt 26 extends across the lower end and front and back faces of thelower projecting portion of each frame, to seal the joint between theframe and the channel 16,

in which it is seated. The outer side face of.

the frames with their margins folded into the grooves of contiguousfront bars of the screen flamesand'are 'sccured therein by strips ofcord 03 which are pressed into the grooves over the cloth and securedtherein by nails (Z secured to the back rails 0 on the outside of thecloth to keep the rear portions of the frames properly spaced and so theparallelism of the frames willbe maintained.

The air is forced from the inlet chamber a at the back of the easinginto the spaces betweenthe screen frames and; thence through thescreencloths andinto the frames,"

and thence forwardly 'throughthe spaces between the front hereof theframe, thedust inthe air, beinga-rrested by the cloth.

The screen unit thus described exemplifies one which constitutes acomplete unit which may lie-individually supported and removed;

inwhich the fabric is padded or cushioned and held 'in spacedrelation'from the frame to reduce the wear on the fabric; in which;

In dust arrestersof this type, it has been the usual practice toprovidemecha nism for: tapping the structure tosubject the cloth to:

vibration which will cause it" to release the dust so it will bedeposited in thedischarge' hoppers; In practice, it'h'asbeen found thatmechanism which imparts a successionof: sharp shocks to the frameresults in causing; 1 rapid wearingou't of'the cloth; Toovercome thisobjection, the present invention provides a mechanism for producingrapid pulsations of the screening units, as contrad-istinguished fromsharp vibrations, or shocks. This mechanism comprises an electric motorE,

which is suspended from a board" secured to bracl'rets'e which aresecured tothe front 0a of the casing. A metal channel bar 6 ex-'tendsacross the front of all or a series of screen units and is securedto each by a pairof bolts e which are fixed in blocks a which aresecured to theframebetween the front barsthereof, so that thebar 6 willbe rigidly secured tothe entireseries of screen-frames; A' verticallyextending bra'cket'or base 6 is; secured to the longitudinal centerofthe bar 6 and is provided with a forwardly'projecting stud eon whichis held an inner race 6 for a series of anti friction balls a An ec--centric orunbalanced'wei' ht or member e extends around stud e andcarriesthe outer race e for said balls which form: an antifrictionbearing between the unbalanced member and the bracket, A hollowcoupling;

member 6 is screw threaded into-the front Spacing blocks 0 (Fig. 2) are7 face of the pulsating member c to' the rear end of a shaft e Saidshaft is d'rivenfromthe shaft 6 of the'motor E by;

a flexible coupling comprising a member a secured toshaftc a member 6secured to the front end of shaft 6 and an elastic driving sleeve 6?which is secured to reduced po'rtions of the members-respectively so asto constitute afle2 1ible driving connection for L the pulsatingdevicewhich will nottransmit the pulsations; ofthe electric motor. Therapid rotation of the member 6 which will impart vibrationsor pulsationswhich will be transmitted through bracket (2 to the pulsating bar Theball-bearing for the pulsating member is disposed -inside-thereof, sothat all the load will be carried by thebracket 0 without transmittingthe pulsations to the. motor. The member 0 isprovided witha chamber- 6""which is adaptedto contain lubricant for the ball-bearing. A packingring 0 is held in the inner end of the member e 'to prevent thelubricant from escaping. The ball race e is secured on stud e 'by a bolt6 provided at its inner end with a nut and washer for clamping the raceon the stud. Coupling member e may be unscrewed from thepul'satingmember and has a plug e so the chamber 6 mayberefilledwhen-desired.

' The invention thus exemplifies a device which is adapted to impartpulsations to the screen'units to cause them to deposit the dustcollect-ed by the cloths without subjecting them to sharp shocks orvibrations, and this has been found to prevent the loosening of thefastenings of the fabric and the resultant wear of the fabrication;alsoa'construction in which the pulsating device operateswithoutimparting vibrations to-the electric motor which drives it.

In theoperation of dust arrestersof this type, it is desirable toprovide-meansfor ef-l fectively and-positively closing a valve fordischarging dust. For this purpose, a valve casing 13- is secured-to theapex of each of the discharge hoppers a and a which isrprovided with aguidef in! which a stem f is -free to-slide vertically; A manuallyoperable lever i pivoted-to the casing, as at f*, is adapted to engagethe lower end of the stem; f todiftihtogether with a valve 7, whichissecured-tothe upperend of'the-stemr The -casing is provided with anannular flange ff" which extends upwardly into the, hopper and a valveseat consisting of a: c. lindrical elastic ring fTfitted around saidange and extending upwardlyitherefrom. 'Valve 7 is colloidal, and itsrim isfl'aredioutwardly and downwardly'toengagethe upper edge of'the,elastic seat ringf'U- When the valve is'closed, itwillr be seated on theelastic ring and will form an: efficient closure to prevent air or dustfrom escaping through the valve. The casing F. is provided with anoutlet, spout f which leads downwardly from; the flange f.

This construction exemplifies a valve for controlling the discharge ofdust from the dust arrester which forms an eflicient closure. Theconoidal valve, seating on the edge of the cylindricalring, will notresult in any leakage when there is collection of dust on said ring.

The invention is not to be understood as restricted to the details setforth, since these may be modified within the scope of the appendedclaims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent, is A 1. In a dust arrester, the combination ofa casing provided with an air-inletand an airoutlet, a series of screenunits each coinprising a frame and fabric sides, a flanged bar at thetop of the casing, blocks fixed in the upper front corners of theframes, bolts passing through the blocks and flange to secure removablythe frames to said bar, and means for removably securing the lower frontcorners of the frame in the casing.

2. In a dust arrester, the combination of a casing provided with anair-inlet and an air-outlet, a series of screen units each comprising aframe and fabric sides, a flanged bar at the top of the casing, blocksfixed in the upper front corners of the frames, bolts passing throughthe blocks and flange to secure removably the frames to said bar, and

means forming. a channel in which the lower front corners are held, saidmeans comprising a removable bar for clamping the lower front corners inthe channel- 8. A filter device for a dust arrester, con

sisting of, a series of independently and individually formed andsecured screening un-' its each comprising a frame and a screen fabricextending over the sides of the frame, the front faces of the framesbeing provided with grooves and sealing strips lapping the jointsbetween the'frames and secured in said grooves. 1

4. A filter device for a dust arrester, con sisting of a series ofindependently and individually formed screening-units each comprising aframe having spaced vertical front bars, and a screen fabric extendingover the sides of the frame, the front-bars being provided with verticalgrooves in the front faces thereof and sealing strips lappingthe jointsbetween the frames and secured in said grooves.

5. In a dust arrester, the combination of a casing provided with anair-inlet and an airoutlet, and a series of screening-units dis-.

posed in the casing said casing being built up of plates so its widthmay be varied, the plates having angular flanges secured together toform joints, one flange of each oint being reverted to extend around theedge of the other flange. l V v 6. A filter device for a dust arrester,consisting of a series of screening units eachcomprisingaframe,fabricside-piecescoveringthe sides of the frame, andpadding extending between and spacing apart the margins of the fabricside-pieces and the side faces of the frame. 1

7 A filter device for a dust arrester, consisting of a series of screenunits each comprising a frame, fabric side-pieces covering the sides ofthe frame, and strips of cord between and spacing apart the margins ofthe fabric side-pieces and the side faces of the frame.

8. A filter device for a dust arrester, consisting of aseries ofscreening units each comprising a frame, fabric sides, a cord betweenand spacing apart the margins of the fabric sides and the side faces ofthe frame, the frame having grooves arranged outwardly of the cord intowhich the edges of the fabric sides are extended, and strips secured insaid grooves to secure the fabric in place.

9. A device for vibrating the filter frames of a dust arr-ester torelease the dust, said device comprising an unbalanced member rotatablysupported by the frames and adapted to vibrate the latter, and means forrotating said member.

10. A device for vibrating the filter frames of a dust arrester torelease the dust, said device comprising. a bar fixed tov the frames andprovided with a laterally extending stud, an unbalanced rotary memberrotatably mounted on the stud, and means for rotating said member. I

11. A device for vibrating the filter units of a dust arrester torelease the dust, said device comprising an electric motor, avibrat-,ing member for the units rotatably supported by the units, and aflexible driving connection for the member driven by the motor, toprevent the vibrationsfrom beingtransmitted to the motor.

12. A device for vibrating the filter units of a dust arrester torelease the dust, said device comprising an electric motor, anunbalanced vibrating member rotatably supported by the units, and aflexible driving connection for the member, driven by the motor, preventthe vibration from being transmitted to the motor.

13. A device for vibrating the filter units of a dust arrestertoreleasethe dust, said device comprising an electric motor, an unbalancedvibrating member rotatably supvibrate the frames comprising anunbalanced member having a portion thereof extending around saidelement, a ball bearing between said portion and the element, and meansfor rotating the member.

Signed at Harvey, Illinois, this 31st day of December, 1926.

RAYMOND H. MOORE.

